Impact of newly measured 26Al(n, p)26Mg and 26Al(n, α)23Na reaction rates on the nucleosynthesis of 26Al in stars

Abstract

The cosmic production of the short-lived radioactive nuclide 26Al is crucial for our understanding of the evolution of stars and galaxies. However, simulations of the stellar sites producing 26Al are still weakened by significant nuclear uncertainties. We re-evaluate the 26Al(n, p)26Mg, and 26Al(n, α)23Na ground state reactivities from 0.01 GK to 10 GK, based on the recent n TOF measurement combined with theoretical predictions and a previous measurement at higher energies, and test their impact on stellar nucleosynthesis. We computed the nucleosynthesis of low- and high-mass stars using the Monash nucleosynthesis code, the NuGrid mppnp code, and the FUNS stellar evolutionary code. Our low-mass stellar models cover the 2-3 Msun mass range with metallicities between Z = 0.01 and 0.02, their predicted 26Al/27Al ratios are compared to 62 meteoritic SiC grains. For high-mass stars, we test our reactivities on two 15 Msun models with Z = 0.006 and 0.02. The new reactivities allow low-mass AGB stars to reproduce the full range of 26Al/27Al ratios measured in SiC grains. The final 26Al abundance in high-mass stars, at the point of highest production, varies by a factor of 2.4 when adopting the upper, or lower limit of our rates. However, stellar uncertainties still play an important role in both mass regimes. The new reactivities visibly impact both low- and high-mass stars nucleosynthesis and allow a general improvement in the comparison between stardust SiC grains and low-mass star models. Concerning explosive nucleosynthesis, an improvement of the current uncertainties between T9~0.3 and 2.5 is needed for future studies.

arXiv commentPublished in MNRAS

References in corpus (37)

• The chemical composition of the Sun
• Modules for Experiments in Stellar Astrophysics (MESA)
• Compact Remnant Mass Function: Dependence on the Explosion Mechanism and Metallicity
• Astrophysical Reaction Rates From Statistical Model Calculations
• Radioactive 26Al and massive stars in the Galaxy
• The nucleosynthesis of Al26 and Fe60 in solar metallicity stars extending in mass from 11 to 120 Msun: the hydrostatic and explosive contributions
• Stellar yields from metal-rich asymptotic giant branch models
• Tables of Nuclear Cross Sections and Reaction Rates: an Addendum to the Paper "Astrophysical Reaction Rates from Statistical Model Calculations"
• s Process in low-mass Asymptotic Giant Branch Stars
• Charged-Particle Thermonuclear Reaction Rates: II. Tables and Graphs of Reaction Rates and Probability Density Functions
• Grids of stellar models with rotation II. WR populations and supernovae/GRB progenitors at Z = 0.014
• Cool bottom processes on the thermally-pulsing AGB and the isotopic composition of circumstellar dust grains
• NuGrid Stellar Data Set. II. Stellar Yields from H to Bi for Stellar Models with Mzams = 1 to 25Msun and Z = 0.0001 to 0.02
• Deep Mixing in Evolved Stars: I. The Effect of Reaction Rate Revisions from C to Al
• Radioactive nuclei from cosmochronology to habitability
• The Effects of Thermonuclear Reaction-Rate Variations on 26Al Production in Massive Stars: a Sensitivity Study
• 26Al and 60Fe From Supernova Explosions
• Si Isotopic Ratios in Mainstream Presolar SiC Grains Revisited
• New estimates of the contribution of Wolf--Rayet stellar winds to the Galactic 26Al
• New results on 26Al production in classical novae
• Magnetic-buoyancy Induced Mixing in AGB Stars: Presolar SiC Grains
• NuGrid stellar data set - III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z=0.01, Z=0.02 and Z=0.03
• Using population synthesis of massive stars to study the interstellar medium near OB associations
• Impact of a revised ${}^{25}$Mg(p,$\gamma$)${}^{26}$Al reaction rate on the operation of the Mg-Al cycle
• Re-evaluation of the ${}^{22}$Ne($\alpha ,\gamma$)${}^{26}$Mg and ${}^{22}$Ne($\alpha ,n$)${}^{25}$Mg reaction rates
• Production of carbon-rich presolar grains from massive stars
• Classical-Nova Contribution to the Milky Way's ${}^{26}$Al Abundance: Exit Channel of the Key ${}^{25}$Al($p,\gamma$)${}^{26}$Si Resonance
• Magnetic-buoyancy-induced mixing in AGB Stars: fluorine nucleosynthesis at different metallicities
• Aluminium-26 from massive binary stars I: non-rotating models
• Reaction rate uncertainties and 26Al in AGB silicon carbide stardust
• Radioactive nuclei in the early Solar System: analysis of the 15 isotopes produced by core-collapse supernovae
• New Multielement Isotopic Compositions of Presolar SiC Grains: Implications for Their Stellar Origins
• Theoretical Evaluation of the Reaction Rates for 26Al(n,p)26Mg and 26Al(n,a)23Na
• Study of (${}^6$Li, $d$) and (${}^6$Li, $t$) reactions on ${}^{22}$Ne and implications for $s$-process nucleosynthesis
• Chemical evolution of ${}^{26}$Al and ${}^{60}$Fe in the Milky Way
• Comparison between core-collapse supernova nucleosynthesis and meteoric stardust grains: investigating magnesium, aluminium, and chromium
• Fluorine production in intermediate-mass stars

Cited by in corpus (1)

• Impact of Newly Measured Nuclear Reaction Rates on ${}^{26}$Al Ejected Yields from Massive Stars